Anil Ahlawat Solutions for Chapter: SOF National Science Olympiad, Exercise 2: SCIENCE

Which one of the following is a right arrangement?

The force that is responsible for revolution of the earth around the sun is:

In an experiment to measure the speed of sound in air, a boy stands $40 \mathrm{m}$ away from a wall and bangs two pieces of wood together. At the instant he hears the echo, he bangs them together again. He does this activity $50$ times. The time taken for $50$ bangs is $12 \mathrm{s}$. Which calculation gives the speed of sound in air?

A student performed experiments taking similar bulbs and cells, but two different solutions $\mathrm{l}$ and $\mathrm{ll}$ as shown in the figure.

She found that the bulb in the set-up $\mathrm{P}$ glows more brightly as compared to that of the set-up $\mathrm{Q}$. You would conclude that:

A plane mirror forms a virtual image. The distance between Mahima and her image in a plane mirror is $10 \mathrm{m}$. How much distance should she move in order to get the distance of $5 \mathrm{m}$ between herself and her image?

Which coil produces the strongest electromagnet for a given flow of current?

According to the given velocity-time $(\mathrm{v}-\mathrm{t})$ graph, what happens to the distance covered by the car from $0-10$ minutes?

Neha conducted an experiment as shown in the diagram.

She placed a nickel coin on a piece of paper and heated them over a flame. After one minute, she observed that some parts of the paper was scorched as shown in the diagram here.
She repeated the experiment with a glass coin placed on the paper. Which of the following best represents the possible outcome of the experiment?